Dipper



June3, 1941- P. v. LARS EN 2,243,965

' DIPPER I Filed March '20, 1940 3 Sheets-Sheet 2 June 3, 1 941.

P. V. LSkRSEN DIPPER Filed. March 20, 1940 3 Sheets-Sheet 3 Patented June 1941 'UNlTED STA'I-ES. PAT

, mrm A Paul V. Larsen, chictgmiilsalslgnolio PettiborieT;

. llin C rp ration. Chicago. m.

' Application maze. mo, Serial No. szss'u scam. (cam- 14s) 1 This invention is directed to adipper for a power shovel. More particularly, the invention is directed to a novel manner of forming the sides and back of the dipper and of assembling the sides and-back with the remaining parts of the dipper structure. J

Prior to this invention it was customary to form the sides and back of a dipper from a single plate of chevron-like shape cut from a rectangular plate and then bent to form the sides and back of the dipper. Cutting of a chevron-like shape from a rectangular plate results in considerable waste, and necessitates the *cutting of a very hard material, such as manganese, steel, along relatively long lines. Furthermore, although the chevron-like shape permitted the sides and back' to be tapered so that they spread downwardly in order to allow material in the dipper to drop freely from the dipper, the-advantage of'forming the sides and back from one piece was'oflset by the costjoccurringthrough the waste in cutting. Again, in prior art assemblies, the side plates were not united to the remaining portions of the dipperin such a manner that a smooth surface V was presented interiorly of the dip r.

An object r this invention is g create a p late adapted to form the sides and back of a dipper,

gence from back to front. The bent plate is then mounted between cast metal frames in such a .manner that the top andbottom edges 1 of its side walls are inclined at an acute angle to the horizontal. A casting which has. an interiorly facing wall lying in a substantially vertical. plane,

forms the front wall. Thus, the cross section of the dipper increases in area from top to bottom,

and any material within the dipper can 'easily drop from the bottom. -'The side plates are'secured to the heavy frame of the dipper by means of'welded-joints which do not penetrate into the interior of the dipper, so that only smooth surfaces are presented interiorly of the dipper.

The means by which'the objects of this in-- ventlon are achieved may be more readily underwhich plate can be out from a rectangular plate with a minimum of waste.

Another object of the invention is to produce a lightweight unit adapted to form the. sides and back of a relatively large dipper. Anotheroblect of the invention is to form a fiat plate of novel outline which can be readily bent to present surfaces spreading downwardly when they become the back and sides of a dipper.

Another object of the invention is to do a minto form'the sides and back of a dipper.

Another obiectof the invention is to provide a novel manner at assembling the'plate forming the sides and back of the dipper with the remaining structural portions of the dipper so that not only is the inner surfaceof the dipper smooth and does not impede/the passage of dirt or other material thereover, but also a stronger faint is;

made between the plate and the'frame, of the dipper. t Generally these objectzfpi the invention are obtained by cutting rela vely small triangular segments fr'omthe ends, and the end portions of one side, of a rectangular plate, and then bending this plate to form two sides and aback; 'In' the bending, the lines of bend are, generally speaking, ,divergen'tly downward so that the plate presents, when assembledwith the dipper,

' imum ofcutting in the shaping of a plate adaptedstood by reference to the-accompanying drawings. in which: a

. Fig. ,1 is a side view of a dipper constructed according to'this invention, a portion being shown in section.

Fig. 2 is a cross-sectional view on the line 2-4 ofFig. 1. v

Fig. 3 is a cross-sectional view .on the linei-i of Fig. 1.

Fig. 4 is a plan, view of a rectangular plate which is to be out along the dot-dash lines to form the.novel plate construction. Fig. 5 is a plan view of the plate cut from Fig. 4.

' Fig. 6 is a side view of the plate after it has bolted, riveted, or otherwise, secured to the front sideof the dipper to complete the'same, this A oasting 8 carrying the teeth Iii. Trap door I2 is hinged at to the rear part offrame 4. The

novel construction of plate 6 is more fully shown in Figs. 4 to .8, inclusive.

In Fig. 4, a rectangular plate i6 is shown from which the novel plate 6' is to be formed. Triana back which-has a plane set-at an angle to the 1 vertical. At the same time, the planes of the' sides are divergent downwardly, and the top edges of the sides'are given a very slight divergular segments II are out from the ends along lines It, and segments I! are cut from the bottom edge. of the plate along the lines 241. It is readily apparent that very little material of the rectangular plate is is wasted in this trimming operation, and, it is clear that considerably less waste occurs thanwere a chevron-llke shape cut from the rectangular plate. As. the plate is usually cut from a very hard steel, the relatively little'cutting required results in a much cheaper way of'fabricating the plate.

' In Fig. 5 the plate 8 is shown after it has been cut from rectangular plate It. ,Before bending,

form one side and half the back, it being noted that these lines are slightly divergent downwardly with respect to the vertical center line 26. In other words, on opposite'sides ofcenter and is secured thereto by a fillet weld 4!.- The other flange iii of frame 4 has its end edge in the same plane as the'plane of the inner surface of plate-30, and is secured to the bottom edge of plate 30 by means of a weld 52. Flange I! has a shoulder 54 which bears against the outer surline 26, bending lines 22 and 22' are'slightly divergent downwardly. Likewise, bending lines 24 and 24' are slightly divergent downwardly. By so bending the plate, a shape such asshown in Figs. 6 to 9 is obtained. It is noted'in Fig. 6

that top ed e 28 of side 20 now formed is inclined at an angle a with respect to the horizontal. Likewise the plane of back 32v of the plate is inclined with respect to the vertical at an angle b. The forward edge of the plate '34 extends vertically because it has been out along the line l8, Fig. 4, while the edge 38 formed by cutting along the line 20, lies horizontally. At the same time, as noted from Figs. 8 and 9, the two side walls 3!! are inclined with respect to the vertical from top to bottom at an angle 0. Furthermore, the upper. edges 28 of the two side plates 30 are slightly divergent from the back 32 to the open end of the plate. It is alsonoticed that the back portion of the plate does not take an absolutely plane form, but is slightly curved, the top edge 38 being curved on a radius R, while the bottom ed e has a curvature R. The top and bottom edges of the corners lying respectively between bending lines 22, 24 and 22', 24' are given corresponding curvatures r and r.

The efiect of this particular manner of bending the plate is to form the sides and back of the dipper from a single plate in such a manner that the cross-sectional area of the interior of the dipper will increase from top to bottom. It is readily apparent that any material held in the dipper will readily fall out thereof when the bottom door I2 is open. In the preferred form of the invention, the angle a is substantially equal to the sum of the angles b and c. f

The plate "is now mounted in and secured to castings 2 and t which complete the bucket. As shown in Fig. 1, the upper and lower edges 28 and 29 of the side walls 30 are arranged, in the finished bucket, at an acute angle to the horizontal, the end or side edge 3d of the side being substantially vertical. This angular inclination o of the top and bottom edges of the side walls makes it possible to avoid cutting away substantial portions at the top and bottom edges of the rectangular plate it which was necessary to obtain the chevron-like form of the prior art.

The sides of the dipper are secured to the upper frame 2 and the lower frame 6 in a novel manner, as illustrated in Figs. 2 and 3. In Fig. 2,

' end 39 of the upper frame 2 is secured to the side plate 30 by a fillet weld 40 exteriorly of the dipper. Flange 42 of frame 2, which forms a portion of the interior surface of the dipper, is onset at 48 to form a shoulder in which side. 30

v is united by means of a butt weld 4t, Thus a compensate for the inclination of the edges 2' and 29 of the sides, it is not necessary in all inface of the plate 30 so that not all the strain of the connection is carried by weld 52. The box.

beam section created provides both strength and lightness, with no protuberences into the dipper.

By the construction described, the sides and back of the dipper can be inexpensively and effectively formed." As the top and bottom hoods stances to cut ofl the comers of the lower edge at l9, Fig. 4. The modification described has been adapted to the. structure of the lower hood 4. It is of course preferable to form the plate 8 with aminimum of cutting.

Having now described a means by which the objects of this invention may be obtained, what I claim as new and desire to secure by Letters Patent is:

I claim: p 1. In a dipper having an upper frame and a plate forming a side of said dipper, said upper frame comprising a channel-shaped member having a vertical web and two horizontal flanges, a third flange depending from one of said two flanges and having a surface aligned with a surface of said plate, a weld uniting the free end of said third flange with the upper edge of said plate, and the free edge of the other of said two flanges abutting another surface of saidplate and being welded thereto.

- 2. In a dipper having a bottomframe and aplate forming a side of saiddippensaid lower frame having 1 a channel-shaped section with flanges of unequal length, the shorter flange being inedge contact againsta surface of said plate and being welded thereto, the lower flange having its free edge in alignment with the other surface of said plate and being welded thereto.- a

3. In a dipper as in claim 2, a flange vertically extending from'said longer flange and abutting said'flrst named surface of said plate.

4. A dipper comprising a frame and having the sides and back thereof formed from a plate havingits top and bottom edges straight and parallel throughout substantially their whole length, said plate being bent along lines transverse to said edges, said plate being mounted in said frame with the parallel top and bottom edges of the side portions of the plate arranged at an acute angle to the dipper axis.

5. A dipper having thesides and back thereof formed of a plate having parallel top and bottom'edges and end edges divergent toward said bottom edge, said plate being bent along lines which are divergent toward said bottom edge'to form two sides and a back, and an upper cast- U-shaped hood piece-having substantially parallel upper and lower edges, the inner surfaces clean, unobstructed surface is presented lathe interior of the dipper. Moreover, frame 2 and plate 30 form a box beam section, great strength and light weight, and with an improved stress distribution therebetween.

In Fig. 3, a bottom frame t is substantially channel-shaped. Flange 48 of frame time an clined downwardly along the arms of the U; the upper edges of said bent plate being secured to edge contact with the outer surface of plate 3155,,

of the U having a recessed portion the edge of which is disposed intermediate the parallel upper and lower edges at the base of the U and is inthe recessed portion in contact with the edge thereof.

PAUL z 

